Sanding-machine.



J. W. KROEZE. SANDING MACHINE.

APPLICATION FILED HDV. 15, 1913.

Patented Ma1130, 1915.

3 SHEETS-SHBBT 1,

oRNmY nui Nolefls PETERS co PHnTnJ 'fun w/wuwnrvN. D. c.

J. W. KROEZE. SANDING MA'CHINE.

APPLIGATXQN FILED Nov.15,191a,

3 SHEETS- Patentad Mar. 30, 1915.v

LELSLGS,

THE NORRIS PETERS CO., PHUTG-LITHOY, WASHINGTON, Dv l J. W. KROEZE.

SANDING MACHINE.

APPLICATION ULEB Nov.15, 1913.

WITNESSES: INVNNTOR 1HE MORRIS PETERS C0., PHDTG-LITHO., WASHINGTON, D c.

UNTED STATES PATENT FFE.

JOHN -W'. KROEZE, OF BURLINGAME, CALIFORNIA.

SANDING-MACHINE.

Application led November 15, 1913.

T all whom it may concern:

Be it known that l, JOHN W. Knonzn, a citizen of the vUnited States, residing at Burlingame, in the county of San Mateo and State of California, haveinvented new and useful Improvements in Sanding-Machines, of which the following isa specification.

rlhis invention relates to a machine for sanding panels and other iiat surfaces, and particularly pertains to a Vmechanism for conveying a panel to and from a sanding belt.

It is the object of this invention to provide a mechanism by which a panel of considerable width can be automatically fed to a comparatively narrow sanding belt so as to effect a uniform sanding throughout the surface of a panel.

Another object is to provide means in an apparatus of the above charactei1 for normally controlling the panel moving mechanism so as to vary the extent of the sand- Y ing of the panel at portions of thesurface thereof where such operation be neces- A sary in order to obtain a proper nish.

A further object is to provide means in an automatic panel sanding machine having a. movable panel-carrying table adapted to travel longitudinally of a sanding belt and transverse thereto, by which the length or distance of travel of said table in either direction may be varied as occasion may require to suit the size of the panel to be sanded.

A further object of the invention is to provide an automatic sanding machine which is simple in construction and eflicient and reliable in operation.

Further objects will appear hereinafter.

The invention primarily resides in a movable frame mounted to travel in transverse relation to a continuous sanding belt, a panel-carrying table movable on said frame longitudinally of the belt, power operated means for moving said frame and table from one source of power in either direction collectively or separately and independent of each other, and means for automatically reversing the 4direction of travel of the frame and the table at variable pre determined points. j v

' The invention further consists of the parts and the construction and combination of parts as hereinafter more fully de- Specicaton of Letters Patent.

. Patented Mar. 3i), i915.

Serial No. $011,203.

scribed and claimed, having reference to the accompanying drawings, in which-- Figure l is a plan view of the invention with parts broken away. Fig. 2 is a front elevation of the machine. Fig. 3 is a vertical longitudinal section on the line o o of Fig. 4. Fig. 4 is a cross section on the line c-c of Fig. 3. Fig. 5 is a detail plan view of one of the adjustable bumpers. Fig. 6 is a detail insection of the belt shoe shifting mechanism. Fig. 7 is a detail of a carriage shifting device. Fig. .8 is a detail plan view of the frame and table shifting mech anlsm. Fig.`9 is a detail in side elevation oit.' same. Fig. 10 is a detail "ertical section onthe line of Fig. 9. Fig. ll is a. detail vertical section on the line geg of Fig. 8. Fig. 12 is a detail vertical section on the line z-a of Fig. 9. Fig. 13 is a detail vertical transverse section on the line i of Fig. 8. Fig. 14: is a detail in side elevation of one of the adjustable stops.

ln the drawings A-A represents a pair of separated frame members which may be of any suitable character and construction. Rotatably mounted on each of the frame members A-A is a pulley wheel 2-2 around which an endless sanding belt B is adapted to travel; this belt B being composed of a suitable fabric having an abrasive substance on its inner surface.

The pulley 2 is mounted on a shaft 3 eX- tending through adjustable bearing blocks 4 4 which in turn are supported upon a movable frame 5, slidable in suitable bearings on the frame A and adapted to be adjusted thereon by means of a horizontally vdisposed threaded screw 6 mounted in a threaded bearing on the frame A.

This screw 6 is provided with a hand wheel 7 on its outer end by means of which the screw 6 may be rotated so as to lnove the slidable plate 5 backward or forward on its mountings in the frame A to move the pulley wheel 2 in such manner as to adjust the tension of the abrasive belt B. j The bearings el-Jl are adjustable on the plate 5 so as to permit of the shaft 3 being alined to adjust the pulley 2 that the true travel of the belt B over the pulleys 2#2 will be insured. The pulley 2 is mounted on a drive shaft 3 revolubly mounted in fixed bearingson the frame A. The shaft 3 is rotated from any` suitable source of power through a pulley 8 which is keyed on the Shaft.. The pulleys 2-2f are. designedaw be spaced ata 'considerable distance apart to l.

obtain la long spanof the sanding or abrasive belt B, which span will be .varied in different machines to suit the length Qi. the.-

materia-l to be handled. Y

Supported yupon theframes- ATA' and horizontally disposed therebetween is a vertically adjustable rectangular sub-frame 9. A downwardly extending threaded bolt 10 on each cornerfof the sub-frame 9 is screwedy into a revolgub'le nuit 11 mountedA between brackets on-the frames A-A.

A shaft 12 is mounted ,on each frame A-Af and each shaft 12 carries a pair of worm gears which mesh with teeth formed on theouter perimeters of the nuts 11. The yshafts 12 are rotated by means of' handwheels 13, so as to revolve thev nuts 11 in their bearings to cause the bolts 10 to move up ordown vso, as'. to raise or lower the subyframe 9. The ybolts 10 are vhingedly connected'to the sub-frame 9 to admit of a certain rocking movement. at that point whichV permits ,either ,end of the sub-frame .being raised or lowered independent Aof the other.V

Mounted on the upper face -o .f the subvframe 9 and transverse thereto, isa number oftrack rails 14 which .extend the full width by 'means of a yhand-wheel 22 which rotates a hollow shaft or sleevev 23, mounted on the carriafge`17, on which. a pair of drums 24 is securelymounted; a pair'Vv of cables .25*215 wound .on the drums 24 having. their tQIfminals extending in opposite directions and attached, to the .ends of the table 20 in such manner that as the drums 24v revolve one cable will be wound on its drum whileA the other cable is nnwound, thus causing the table 2 OtoV mpve along the carriage 17.

From the foregoing it will be seen that the l table 2Q may be moved into .any position desiredfbeneath the, belt B, longitudinal adjustment being: obtained by loperating the hand-wheel 22",l lateral adjustment by moving the carriage. 17 onl the sub-.frame 9, and ,theY horizontal plane of, the table 2O being adjusted. by the hand wheels 1 3 by which the adjustment. permits 0f the distance .separating the table 20 .from the upper. Strandff 'the' beltB being regulated', as desired.V

j causes. both shafts vto rotate in one or the other isrevolved.

Mean-s are provided 'by which the table 20 may operate mechanically, that is, drivenby l power. Y

The essence of the present invention resides in the mechanism for moving the .frame 17 and the table 20 on thei-rrespective track-rails so VVas to convey 'a panelcarried by the table 20 lengthwise of the abrasive belt B and transverse thereof, or in a diagonal direction in relation to the belt, by operating .the frameand table in'unison. The mechanism vformovingthe table 20 comprises a pair of drums 2 4, having oppositelyV wound cables 25 and 25 thereon, ythe ends of' which are .connected to the opposite ends of the table, as shown in Fig. 1; the cables'25 l and 25 being so wound on 4the drums 241that when. the latter is rotated in either direction, as will ,be later described, one of the .cables will Wind on the drum Vto Vmove the table 2O in one direction, while the 'other unwind from the drum. TheV drums 24 are rigidly mounted on a cablewill tubular shaft 23, Vjournaled inv suitable bearings onthe underside of the'table 20. EX- tending into `the tubular shaft 23 from therear side of the machine is a square shaft 23 Awhich permits of a telescoping action ofv the shafts 23 and 23, and at the same time vunison whenV Theouter end'of .the shaft 23 carries a i n shiftable .clutch member 26, which islslidable lengthwise on the shaft 23v and mounted to rotate thereon. y normally held in engagement with Aa correspondingclutch member 27 bymeans of a The clutch member 26V is spring 2S wound on the shaft 25. and bear- Y the shaft 33 on each'side of the pulley wheel i 34 are idler pulleyv wheels 35 fand '36.

Two continuousbel-ts 37 and 38, the latter being: a cross belt, *areprovided and are adapted to be shifted sof that .either of the belts may be positioned on the Ycentralpulley wheel 34,whiile, vthe other belt will be ona loosepulley wheelI 35,*or 36; Vor both belts positioned intermediate the central pulley V'wheels and 3.6 so as to neutralizevtheir action on the centralr pulley wheelv 34jk and V render the latter stationary. Y

The belts 37 and 38 lead to and pass aroundV pnllely wheels 39 and40Y on thedrive'shaft3f.' By s;

the. central'. pulley .Wheel 34 the. dretonvf rotation ofthe latter may be changedas ocfting the. belts 37 and-5.8 to orlfrm casion may require, so as to rotate the drum 24 in either direction when the clutch members 26 andv 27 are in engagement with each other.

Means are provided for automatically shifting the belts 37 and 38 when the table 2() has reached an adjustable predetermined point in its travel in either direction so as to automatically reverse the direction of travel of the table. This means consists of a slidable bar 41 mounted in suitable guides and having an upwardly extending standard 42 formed with an eye through which the upper run of the belt 37 passes, and also carrying a hanger 43 formed with an eye through which the lower leaf of the cross belt 38 passes. This bar 41 is adapted to be moved longitudinally by means of a revoluble cylinder 44 disposed adjacent to the bar 41 and having a spiral groove 45 formed in its periphery into which a pin 46on the bar 4] extends.

The drum 44 is rigidly mounted on a shaft 47, journaled in suitable bearings, and connected at one end to a square shaft 48 extending into and adapted to telescope with a shaft 49 supported in suitable bearings on the frame 19; the shafts 48 and 49 being movable longitudinally in relation with each other and adapted to rotate in unison.

The shaft 49 carries a pinion 50 thereon which meshes with a gear' 51 carried by the frame 17J which in turn meshes with a hori- V zontal toothed rack 52 mounted on a reciprocal bar 53 extending longitudinally of the frame 17 and slidably supported in suitable bearings at each end of the frame 17.

Mounted on the rod 53 opposite the ends of the table 20 are adjustable stops 54, the construction of which is particularly shown in F ig. 14. Each of the stops 54 consists of a split externally threaded conical sleeve 55, to which the stop 54 is attached, slidable on the rod 53, having a nut 56 screwed thereon and contacting with a collar 56 adapted to contract the split sleeve 55 and clamp it in any desired position on the rod 53.r The stops 54 extend upwardly into the path of travel of the ends of the table 20 in such manner that when the table strikes a stop 54 the rod 53 will be moved lengthwise so as to cause the rack 52 to move therewith and thereby rotate the shafts 49-48 and 47, through the gear 51 and pinion 50, and thereby rotate the drum 44 and cause the spiral groove 45 to act on the pin 46 to move the bar 41 lengthwise and thereby shift the belts 37 and 38, to change the direction of rotation of the drum 24 and accordingly reverse the direction of travel of the table 20. From the foregoing it will be seen that the table V20 may be caused to travel back and forth at variable distances according to the location ofthe stops 54, by the power-driven and automatic reversing mechanism just described.

As a means for stopping the movementk of thetable 20 and retaining it in a stationary position without cutting out the pulley wheel 34 and stopping the mechanism controlled thereby, a clutch shifting device is provided. This device consists of a cam segment 57 on a square shaft 58 telescoping with a sleeve 59 on the frame 17 the cam disk 57 having a raised portion 60 arranged to be moved into engagement with a shoulder 61 of a ring 62, surrounding the clutch member 26.

The sleeve 59 is provided with a hand wheel 63 on its outer end by the manipulation of which the clutch member 26 may be thrown in and out of engagement with the clutch member 27, as may be desired, and

thereby throw the drum 24 in or out of operative connection with the pulley wheel 34.

A hand-wheel 22 is mounted on the shaft 23 at the front of the machine to permit of the manual. reciprocation of the table 20, as occasion demands, and a hand-wheel 64 is mounted on the shaft 49 to permit of the manual operation of the belt shiftingdevice so that the belts 37 and 38 may be moved in or out of respective engagement with the pulley wheel 34 and into a neutral position independent of the table controlled mechanism.

The frame 17 is designed to be moved in a direction at right angles to the direction of travel of the table 20, either continuously or intermittently, at strokes of travel of any predetermined length within the scope of travel of the frame. The reciprocation of the frame 17 is accomplished by means of a worm-shaft 65, having right and left-hand spiral grooves f and g formed thereon; the shaft 65 being disposed transversely beneath the frame 17 and supported at its ends in suitable bearings.

lThe connection between the frame 17 and the shaft 65 consists of a sleeve 66 slidably mounted on the shaft 65 and pivoted centrally on its horizontal axis to hangers 67 depending from the rear longitudinal side member of the frame 17. The sleeve 66 is recessed at its ends to receive annular disks or rings 68 and 69 which surround the shaft 65 and are connected thereto by means of inwardly extending teeth z, and z which are formed on the rings 68 and 69, respectively, and extend into the spiral grooves f and g. The rings 68 and 69 are held in place in the recesses in the sleeve 66 by means of caps 70 which are screwed on the ends of the sleeve 66, as particularly shown in Fig. 3.

lnterposed between the sides of the rings 68 and 69 and the adjacent sides of the sleeve 66 and caps 70, are anti-friction end-thrust bearings 71. The outer peripheries of the rings 68 and 69 are formed with V-shaped teeth 72, and pivoted at 73 in a longitudinal slot on the underside ofthe sleeve 66 is a rocker arm 74, the outer ends of which are formed with teeth 75'1nd 75, adapted to eX- tend between the teeth 72 on the ringsr 68 and`69. Thev rocker arm 74 is'designed tobe rocked so that when the tooth 75 lis `engaged with the teeth 72l on the ringl 69, the toothv 75 will be disposed out of engagement with the teeth'on the ring 68, as shown in Fig; 3. A detent spring 76 of any suitable construction is secured to the rocker arm 74 and opand forward with the frame 17, as will be 2o mounted. Formed on the ratchet wheel 81 Y crates to ymaintain the latter' in eitherof its tilted positions.

Projecting downwardlyfrom the arm 74 at its center is a finger 77 which extends between a pair of parallel rods 78disposed beneath the shaft 65. Adjustably mounted onV the rods 78 are spring-pressed bumpers 79 which extend in the path oftra-vel of the finger 77 as the latter is moved backward later described, and operate to rock` the rocker arm 74 to throw it out of engagement .with one of the rings 68 and 69 and into engagement with the other ring. The shaft is designed to be rotated continuously in one direction from the shaft 33, irrespective of the'direction of. rotation of the latter.

Vparticularly shown in Figs. 8 and 9, is provided. rlfhis transmission mechanism is constructed as follows,'reference being had to .Fig 81: Loosely mounted on a yreduced. portion of the shaft 65 is a sleeve 80, on which al pair of spaced ratchet Wheels 81 and 82 is isa ratchet clutch member 83 adapted to be engaged by a corresponding shiftable clutch member 84, splined on the shaft 65l andnormally held in engagement with the clutch member 83 by means of a spring 85. Loosely mounted'on the sleeve 80, between the ratchet Wheels 81 and 82, is a spur gear 86 and a vsprocket wheel 87, and mounted on the outer faces ofthe spur gear and sprocket wheel' lare pawls 88 and 89,.which normally engage the teeth of the ratchet wheels 81 and 82. Meshing with the spur gear 86 and the pin'- ion 29 is a series of intermeshing transmission gears 90-91-92 .and 93, mounted in` shaft 65 will be rotated in the corresponding direction, and when the sprocket wheelr 87 is rotated in the direction opposite the arrow the shaft 65 will continue to rotate in the same direction. The shaft 65 will therefore be rotated continuously in one direction from the shaft 33, during the time the clutch members 83 and 84 are 1n engagement with' For y this purposel the transmission mechanism,

each other. When the shaft 65 is rotated, the rings 68 and V69 will be revolved therewith by reason of their engagement with the Vspiral grooves fand g. Bylocking either of the rings 68 or 69 against rotation," which is accomplished by interp'osing atooth 75' or 75 on the arm 74 between adjacent teeth 72 on a ring 68 or 69, Ythe sleeve {S6-.will be 'caused to travel longitudinally of the shaft l throw .the tooth 75 or 7 5 thereon out of engagement with one of the rings 68 or 69, and throw the other tooth into engagement Vwith the other ring, thereby locking the latter against rotation and causing reverse movement/of the frame 17. In this manner y constant reciprocating movement 'of the frame 17 is accomplished; the length of travel being governed by the location of the adjustable bumpers 79,. Y

Means are provided for automatically stopping the movement of the framel 1.7 at intervals so as to -give it an intermittent movement with a sufficient pause between each movement to allow the table 20to` traverse. the length of its longitudinal move-Y ment in one direction. This means consists of a pivoted segmenti-96, having a cam face 97 adapted to travel in and'out of engagement with a'pin 98 secured to an arm 99, slidably supported upon the rods 78 Y and adapted to engage with the clutch member 84:. y Y j A downwardly extending arm 100 on the K segment 96 is attached to a connecting'rod 101 by means of a link 102. The connect#v ing rod 101/extends horizontally beneathY the frame 17 and is connected at its outer f end to an arm 103, mounted on the-rockshaft'48. The segment 96, 'cam'97, rod 101 and link 102 are so arranged in relation to leach other and to the shaft 48vthatwhen the latter is in its normal stationary posi- `tion the cam 97 will bear against-the rod 7 8 Vand thereby retain the clutchY member 84 out of engagement with the Vclutch member n 83, thus-causing the frame 17 to remain sta- `48 acting `to operate the segment 96 and move thev cam 97 out of engagement with the pin 98 so as to allow the spring 85'to'VY .throw the clutch member 84fintoengage 4 ment with the clutch member 83, thereby causing the shaft to be momentarily rotated. The release of the pin 98 from the cam 97 is effected intermediate the stroke of the rock-shaft A8, so that when the latter completes its stroke the cam 97 will again be thrown into engagement with the pin 98 so as to normally hold the clutch member 8A out of engagement with the clutch member 83. The table 20 will thus move practically the length of the stroke, while the frame 17 is stationary, and when the table 20 nears the end of its stroke will act to shift the belts 37 and 38 to reverse its direction of movement, and at the same time operate the clutch member 8A to cause the rotation of the shaft 65, and thereby effect a short movement of the frame 17 g the movement of the frame 17 taking place during the shifting of the belts 37 and 38. This movement of the frame 17 is such as to move the panel carried by the table 20 laterally of the belt B in overlapping steps; the table 20 carrying the panel longitudinally beneath the sanding point of the belt B during the interval between the step by step movements of the frame 17.

A rod 10st connects with the cam segment 96, and leading to the front of the machineV is provided with a hand-hold 105, by means of which the segment 96 can be manually rotated in opposition to a spring 96', when it is desired to maintain the clutch members 83 and 84 in engagement with each other, independent of the cam 97. This is done when it is desired to cause the frame 17 to move simultaneous with the reciprocation of the table 20, so as to move the panel in diagonal relation to the belt B. The frame 17 will then move constantly from one side of the machine to the other and will be automatically reversed at the end of each stroke by the operation of the arm 74, as before described.

A hand-wheel may be provided on the shaft 65, by which the latter can be manually rotated when it is desired to shift the frame 17 independent of the driving mechanism.

l/Vhen it is desired to cause the frame 17 to remain stationary during a number of reciprocations of the table 20, the clutch member 84 is held out of engagement with the clutch member 83 by means of a rod 98", connected to the arm 99 and leading to the front of the machine; the rod 98b being secured against movement by a catch 98a when the clutch member 84 is out, or the rod may be manually held against movement to temporarily retain the clutch members 83 and 84 out of engagement.

Clamped on the upper end of a standard 106 is a horizontally disposed arm or bracket 107 which extends transversely across the machine and terminates above the belt B midway between the pulleys 2--21, in a vertically disposed tubular member or bushing 108. Mounted in the bushing 108 is a cylindrical casing 109 which has rack teeth formed on its side adapted to be engaged by gear teeth on a segment 110. The segment 110 is pivoted at 111 and has a lever handle connected thereto by means of which the segment may be rocked on its bearing to adjust the position of the casing 109 in the bushing 108. A thumb screw 112 on the segment lever extends through a slot on a bracket formed on the bushing 108 and is provided for the purpose of clamping the segment lever in a Xed position.

Mounted in the casing 109 is a plunger 113 on which is secured a stem 114 which extends upward through the top of the casing 109 and is guided therein. A spring 115, wound on the stem 1141- between the top of the plunger 113 and the end of the casing 109, normally retains the plunger in its lowermost position, and forms a cushion against upward pressure on the plunger 113.

A cross-head or bracket 116 is rigidly mounted on the lower end of the plunger 113 through which upwardly extending threaded studs 117 on a shoe 118 extend; wing nuts 119 being screwed on the upper ends of the studs to clamp the shoe 118 against a knob formed on the underside of the cross-head 113. The shoe 118 normally contacts the upper surface of the belt B f when the casing 107 is in its intermediate position.

In operation, a panel or board 120 to be sanded is placed on the table 20 beneath the abrasive belt B and the level of the table is adjusted by the hand wheels 13 and their connections, to suit the thickness of the material to be worked. The frame 17 and the table 20 are then moved to the desired position in relation to the belt B and the shoe 118. The driving pulley 2 being then set in motion and the shoe 118 lowered upon the belt B, the latter is thrown into contact with the panel on the table 20 and is drawn theretcross by the rotation of the driving pul- It is obvious that the area of working surface of the belt B will be that of the shoe 118, so that in handling a panel of considerable size it will be necessary to shift from side to side and longitudinally, which is accomplished by operating the carriage 17 and the table 20, as before described, to bring the entire surface of the panel on the latter under the shoe 118.

A valuable feature of this machine is its adaptation for sanding thin veneers and 1inished panels, and that in subjecting the panel to the action of the abrasive belt B, the edges and corners of the panel will not be rounded off, for the reason that the belt B slopes downward in passing under and l i away from the shoe 11S, thereby confining vthe sanding action of the belt to the flat surl face of the shoe 118. This feature is iniportant inasmuch as the rounding of the edges and kcorners of veneered panels and the like is objectionable.

Having thus described my invention, what I .claim and desire tosecure by Letters Patent, is Y f l.V In a panel sanding machine, the com .,bination of a movable frame,1a table mounted to travel longitudinally on said frame at right angles to thedirection of .travel of theV Y -vf ranie, aV movable'frame thereon, a wormshaft, means for imparting movement f. to said fiamelby the rotation of the wormshaft a table mounted. to travel longitudinally ofthe movable frame,a drumhaving oppositely wound cables thereon connected with the table, means for i'otatinglsaid drum in valternate directions controlled by said table, and means foi` driving the worin-shaft from theY drum rotating mechanism by whichzt'he worm-shaft will be rotated in one directionfonly. 'Y

3; In a panel sanding machine, a movable `frame,za-wormshaft, means by which the rotation of the worm-shaft in one direction will" impart reciprocal movement to 'the frame, a table mounted to tr-avel longi'tudif nally on the, frame, a shaft,a drum on saidv shaft, oppositely wound cables on said drum attached to the oppositev ends of the table, a vrock-shaft, means for actuating the rockl shaft by the movement of the table as Vthe latter nears theends of its stroke, means controlled by the rock-shaft for alternately rotatingthe shaft and drum thereon in opposite directions, means for rotating the worm-shaft in one direction connecting with the d rumfshaft, and means controlled by the table for throwing the worm-shaft in and out of operative connection with the drumshaft.

4Q In a sanding machine, in combination, with a carrier, a tableth'ereon, and sanding means arranged .over the table, constantly rotated means to move the carriage, a'shift-V able device, means whereby said device is shifted by and upon the table reaching its extremes of movement, and means normally disconnected from the vconstantly rotatedV means and moved into connection therewith by said device to thereby effect operation of Vthe carriage. Y

5. In a sanding machine, in combination,

vwith a carriage, 1.a Ytable thereon :and

means .cooperating with the table, means 'to move the carriage, Vmeans wherebyvsaid moving .means ymay bereversed, Vmeans to reciprocate the table on the carriage, andfmeans ,actuated by the carriage upon reachingvits extremes .ofz movement .to effectv automatic operationof the reversing means.

6.Y In a sanding machine, 1n combination with a sanding means,4 a carriage anda table.

on the carriage, meansto reciprocate the table, means .to move the carriage includingv a driving element, a driver, a normally inopn erative clutch vbetween lthe driverfandl driving element, a .rock shaft, means whereby to the rock shaft and said clutch whereby uponmovement of the rock shaftsaid clutch `will ybe rendered ,operative to driven said driving elementV and thereby the carriage.

7. Ina sanding machine, in combination so the table upon the ends of its .strolres'will n .actuate the rock shaft,;and` means 'connected 'with a sanding means, a carriage anda table y on the carriage, means to reciprocate the table, vmeans to move the 'carriage 'including a driving element, a 'driver, a normally inoperative clutch .betweenfthe driver and driving element, a rock shaft, means whereby the table upon. the ends of itsV strokes will actuate the rock shaft, a'pivoted cam normally acting to hold theclutch inoperative, and a connection between the rock shaft and saidjcam whereby upon movement of the rock shaft said cam'will be Yactuated to allow the clutch'to'couple the driverand driving element to thereby actuate the carriage. Y f 8; In a panel sanding machine, .the combination with anabrasivefbelt, of apanelcarrying table, means for,V moving the table lengthwise ofthe belt, separate means for moving the Vtable transverse .Y of thev belt vadapted. to 'move continuously or `step by step, and means for automatically 4,reversing the direction of movement of the `tablejboth in transverse and longitudinal relation to the belt.

iin,

9'. In a panel sanding machine the -combi` nation with an vabrasive belt, of a vpanelcarryingta.ble, means for moving the table lengthwise ofthe belt., separate means Afor moving the Atable transverse vof the belt adapted to move continuously or step by l step, means Vforr automatically reversing. 'the direction of movement of the table both in transverseand longitudinal relation to the belt, andjmeans for adjusting the length ofi travel of the table in r'elationto the belt.

l0; In a sanding machine, a frame, a sand-Y Ying means, a` carriage on the frame movable laterally thereof, a table ony the carriage movable longitudinally thereof, a shaftj Y means actuated by, theshaft formoving the table, a secondy shaft, a slidable rod having V,stops thereonfor engagement with the table,

4ias

means whereby sliding of the rod will actuate the second shaft, reversible Adrivingl means, means connected to the driving means and to the second shaft whereby actuation of the latter will eect reversal of movement of the driving means, means actuated by the driving means to operate the first named shaft, a third shaft, reversible means between the third shaft and ca 1riage, whereby the direction of travel of the carriage may be reversed, means for continuously actuating the third shaft from the driving means, and means operated by the carriage for actuating said reversible means of the third shaft.

ll. ln a sanding machine, a frame, a sanding means, a carriage on the frame movable laterally thereof, a table on the carriage movable longitudinally thereof, a shaft, means actuated by the shaft for moving the table, a second shaft, a slidable rod having stops thereon for engagementl with the table, means whereby sliding of the rod will actuate the second shaft, reversible driving means, means connected to the driving means and to the second shaft whereby actuation of the latter will effect reversal of movement of the driving means, means actuated by the driving means to operate the first named shaft, a third shaft, reversible means between the third shaft and carriage, whereby the direction of travel of the carriage may be reversen, means for continuously actuating the third shaft from the driving means, and means operated by the carriage for actuating said reversible means of the third shaft, and means actuated by the driving means for periodically and momentarily rendering the third shaft inoperative.

12. ln a sanding machine, al movable carriage, a table movable on the carriage at right angles to the direction of travel of the carriage, a sanding belt traveling longitudinally of the table and thereover, means to reciprocate the table longitudinally of the a belt, constantly rotated driving means and means to periodically engage said driving means to move the carriage laterally of the belt step by step so as to allow the table to travel throughout a complete movement thereof during the periods lapsing between the movements of the carriage.

13. ln a sanding machine, sanding means, worlr supporting means, means to reciprocate the worlr supporting means longitudinally of the sanding means, means to move the carriage lateraliv of the sanding means step by step so as to allow the work supporting means to travel throughout a complete movement during the periods lapsing between the lateral movements of the work supporting means and means whereby said carriage moving means may be operated to provide continuous movement of the carringe. v

lil. In a sanding machine, sanding means,

a carriage, a table on the carriage, the care riage and table being relatively movable at right angles to each other, a shaft having right and left-hand spiral grooves, a member connected to the carriage and slidable on said shaft, means for connecting said member to either the right or left-hand groove of said shaft, means to actuate said connecting means, stops for operating said actuating means upon completion of predetermined lengths of movement of the carriage, and means to move the table.

l5. ln a sanding machine, sanding means, a carriage, a table on the carriage, the carriage and table being relatively movable at right angles to each other, a shaft having right and left-hand'spiral grooves, a member connected to the carriage and slidable on said shaft, a pair of independent devices for connecting said member to the respective right and left-hand grooves of said shaft, a rochable device connected to each of said devices whereby when one is moved to operative position the other will be simultaneously operated to inoperative position, stops for engagement with opposite sides of said ioclrable device ,to actu-.ate same, and means to move the table.

i6. ln a sanding machine, a movable carriage, a table movable on the carriage and at right angles to the path of movement of the carriage, driving means, means connected to the driving means and to the table for actuating the latter, means actuated by the table movements to reverse the direction of travel of the table, means actuated by the driving means to operate the carriage, and means actuated by the carriage movements to reverse the direction of travel of the carriage.

17. In a sanding machine, a movable carriage, a table movable on the carriage and at right angles to the path of movement of the carriage, means for actuting the table, and means also connected to said actuating means for intermittently operating the carriage and for selectively and manually enabling the last named means to continuously operate the carriage.

i8. ln a sanding machine, a movable carriage, a table movable on the carriage and at right angles to the path of movement of the carriage, means for actuating the table, means for actuating the carriage, means for` reversing the carriage, and means actuated by the table upon reaching the end of travel thereof for eiiecting momentary actuation of` the carriage actuating means whereby to move the carriage in step by step order.

19. ln a sanding machine, a movable carriage, a table movable on the carriage and at right angles to the path of movement of the carriage, means to actuate the table, means to reverse the movement of the table, a constantly rotated driver, normally quiescarriage, reversible means actuatedrby the cent driving lmeans for the carriage for advancing same, meansl for moving the carriage driving means into engagement with the driver, and means actuated by the table upon the latter reaching an end of lits travel for operating said means which renders the v carriage driving means operative.

- ments to actuate said reversible means, re-

versibleV means for operating the carriage,

. and means actuated by the carriage upon the Vlatter reaching thel ends oI'l its movements to lactuate said last named reversible means.

f 21; In a sanding machine, a movable carriage, a table movable onY the carriage and at right anglesto the path of movement of. the

table to reverse the Amovement thereof, Ire'- versible means i''o'r actuating the carriage,

' `with a* sanding: means, and a table rcomeans whereby the table actuating means periodicallyy operates,v the carriage, and

means for reversing the direction of travel `of the carriage upon the same Vreaching `its limits `-oi'iinovement 22:;In' a sanding: machine, in combination,

, operating therewith, means to move the Copie! of 'this nement-may 'beV obtained vfor table transversely of vthe sanding means at -riage operating means(Y mamas' intervals yor continuously, and means to effect movement of .the tableY longitudinally f.

of the sanding. means throughout the said periodic. or continuous transverse movement of the ta1ole'. Y s Y Y In alsa-riding machine, in combination,

with sanding means, a table coperating therewith, and a carri-age on which the table is mounted, driving means for the table', re'- versing means for Vthe table driving. means, normally quiescent means. to'actuate the carriage, and a unitarymeans actuated -by the table movements' to simultaneously operateY `said reversing means of the table and to i' render said'ca'rriage actuating'means operative.l

24k.- In a sanding machine, in combination,

with sanding means, a tableA coperating 1" therewith, and a carriage on which the table is mounted, driving means for. the table, re-

versingfineans for the table driving means,v means -to operate the carriage, 'and means' actuated' by ,the table movements to both actuate saidreversing means and to periodically a'nd 'simultaneously actuateY the car- In testimony whereof I have hereunto set my hand in the presence of two subscribing Vwitnesses.'

l JOHN KROEZE. Y

Y fitnessesz l JOHN I-IERRING, WV. W. HEALEY,

ve cents each, by addressing the""Commssioner-of '.Patents. i Y Y Washing'ton,D-.C. Y 

